There's nothing wrong with you, what you're trying to do is actually quite hard! Be kind to yourself, it sounds like you're overwhelmed by the enormity of the task in front of you.
Your list is two different things:
First category is habit building (eg multivitamins). Habit building takes time. Do not try and build too many at once.
Second is doing a long procrastinated task (eg sort out finances). These tasks get big and overwhelming, so when you tackle them there is a first stage of doing the "big bit" (sorting out) and then building a habit that stops you getting back into that state.
I'd make yourself two lists separating them out. Then pick one off each list to tackle, and the rest can wait.
From your list I would pick:
Multivitamins, because it's the easiest. Put them somewhere like next to your toothbrush, next to the coffee etc - attach it to something you already do. I need daily prescription meds so it's easy for me to attach it to that for instance. It doesn't matter what time of day you take them - the habit is "take multivitamins daily" not "take multivitamins in the morning" for instance. Don't try and tackle another habit for a couple of weeks.
Then I'd pick finances. I find if my finances are tidy it frees up a lot of brain space for other things. Set aside an afternoon to do it and stick to your commitment - it's annoying but it will take a chunk of time to do. Decide what "sorting out finances" actually means - is it getting your current account straight? Reviewing direct debits? Setting up savings accounts? Break it down into distinct tasks and make a list. Then work your way through it one by one.
For the exercise one, again break it down into stages and achievements. Some people start with "if I get to the gym I've succeeded" and find once they're they will do a workout - but they don't put the pressure on of "must do high intensity Olympic standard cardio and weight lifting". So commit to, say, doing something from your exercise programme once a week - anything is better than nothing right?
If a habit isn't sticking don't give up, give it another go and modify what you were trying to do. For instance, if putting the vitamins next to your toothbrush didn't work, try putting them on your bedside table.
I'd also look at your list and see if you can take some things away. Do you really need or want to keep in touch with all those people? Is a cleaning routine really necessary or can you modify it, for instance I just commit to leaving the kitchen tidy every evening and making sure the bathroom is clean. Can you get a gadget that helps? Dishwasher is a must for me, and recently I bought a cordless hoover that makes it much easier to whizz it round, so I hoover much more frequently now. For your exercise - does it have to be that routine? Could you start by eg committing to a daily half hour walk and build from there? Don't make your goals too big and overwhelming.
Someone will be along to mention adhd shortly. What I'll say about that (as someone who has is) is that regardless of the underlying reason you still have to put in effort to make it work, or you'll give up entirely.